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  <title>将角度转换为弧度</title>
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 <body class="docs"><div id="layout">
  <div id="layout-content"><div id="function.deg2rad" class="refentry">
   <div class="refnamediv">
    <h1 class="refname">deg2rad</h1>
    <p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">deg2rad</span> &mdash; <span class="dc-title">
     将角度转换为弧度
    </span></p>

   </div>
 <div class="refsect1 description" id="refsect1-function.deg2rad-description">
  <h3 class="title">说明</h3>
   <div class="methodsynopsis dc-description">
    <span class="methodname"><strong>deg2rad</strong></span>
     ( <span class="methodparam"><span class="type">float</span> <code class="parameter">$number</code></span>
    ) : <span class="type">float</span></div>

    <p class="para rdfs-comment">
     本函数把 <code class="parameter">number</code> 从角度转换成弧度。
    </p>
   </div>

    <div class="refsect1 parameters" id="refsect1-function.deg2rad-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    
     <dt>
<code class="parameter">number</code></dt>

     <dd>

      <p class="para">
       以角度为单位的值
      </p>
     </dd>

    
   </dl>

  </p>
 </div>

 <div class="refsect1 returnvalues" id="refsect1-function.deg2rad-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para"> 
   <code class="parameter">number</code> 等量的弧度值
  </p>
 </div>

 <div class="refsect1 examples" id="refsect1-function.deg2rad-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-4125">
    <p><strong>Example #1 <span class="function"><strong>deg2rad()</strong></span> 例子</strong></p>
    <div class="example-contents">
<div class="phpcode"><pre><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /><br /></span><span style="color: #007700">echo&nbsp;</span><span style="color: #0000BB">deg2rad</span><span style="color: #007700">(</span><span style="color: #0000BB">45</span><span style="color: #007700">);&nbsp;</span><span style="color: #FF8000">//&nbsp;0.785398163397<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">deg2rad</span><span style="color: #007700">(</span><span style="color: #0000BB">45</span><span style="color: #007700">)&nbsp;===&nbsp;</span><span style="color: #0000BB">M_PI_4</span><span style="color: #007700">);&nbsp;</span><span style="color: #FF8000">//&nbsp;bool(true)<br /><br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</pre></div>
    </div>

   </div>
  </p>
 </div>

 <div class="refsect1 seealso" id="refsect1-function.deg2rad-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="rad2deg.html" class="function" rel="rdfs-seeAlso">rad2deg()</a> - 将弧度数转换为相应的角度数</span></li>
   </ul>
  </p>
 </div>

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